Lightsim2grid

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- [FIXED] backward compat with "future" grid2op version with a
better way to copy `LightSimBackend`

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- [FIXED] a bug in DC powerflow when asking for computation time: it was not reset to 0. when
multiple powerflows used the same solver
- [FIXED] a bug in AC and DC powerflow when shunts had active values
- [ADDED] possibility to initialize a powergrid based on pypowsybl
see https://github.com/Grid2Op/lightsim2grid/issues/53
- [ADDED] some more algorithm to perform powerflow: Fast Decoupled Powerflow (in BX and XB variant)
see https://github.com/Grid2Op/lightsim2grid/issues/63
- [ADDED] build lightsim2grid for python 3.12
- [ADDED] support for non distributed slack but multiple slack buses
see https://github.com/Grid2Op/lightsim2grid/issues/50 (ONLY FOR AC powerflow)
- [IMPROVED] now shipping `src` and `eigen` directory in the source of
lightsim2grid to allow their installation if wheels are not provided.
- [IMPROVED] in the underlying cpp GridModel powerlines can now have 2
different values for the `h` parameters (`h_or` and `h_ex`).
- [IMPROVED] now lightsim2grid is able to load a pandapower network with non
contiguous non starting at 0 bus index

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- [FIXED] a bug where, when you disconnect a load (or gen), the next action cannot be performed
if it modifies the load (or gen), because you "cannot change the value of a disconnected load (or gen)"
- [FIXED] read-the-docs template is not compatible with latest sphinx version (7.0.0)
see https://github.com/readthedocs/sphinx_rtd_theme/issues/1463
- [IMPROVED] initialize the underlying "PandaPowerBackend" without numba
- [IMPROVED] grid2op import to be more compliant with renaming of uppercased file names
- [IMPROVED] decoupling of the PandapowerBackend class and the class "internally" used by LightSimBackend
when loading the grid. This caused some issue, *eg* https://github.com/Grid2Op/grid2op/issues/508

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- [FIXED] a bug in the `init` function that caused issue when importing a grid with multiple slack
on some cases
- [FIXED] some bugs in the "SecurityAnalysis" and "TimeSerie" modules especially in DC mode.
- [FIXED] a bug in the DC comptuation: some "divergence" were not catched
- [FIXED] a bug in the "Computer" (cpp) class where the intial voltage could lead to generator not
participating correctly to the voltage regulation (wrong output voltage level).
- [FIXED] a bug in the "set_bus" of shunt (wrong bus was assigned cpp side)
- [FIXED] an issue when slack bus is added from ext grid (wrong active power value - sign issue)
- [ADDED] support for the CKTSO linear solver (on linux), which is slightly faster than SparseLU, KLU and NICSLU
(this requires a compilation from source)
- [ADDED] support for distributed slack bus in `LightSimBackend`
- [ADDED] support for "generator with p=0. do not participate in voltage regulation" in `LightSimBackend`
- [ADDED] support for the DC computation for "SecurityAnalysis" and "TimeSerie" modules
- [ADDED] support for DC powerline (in lightsim, they are still not handled in grid2op)
- [IMPROVED] now that multiple slacks is fully supported, the warnings when importing a grid with multiple slacks
are irrelevant. They have been removed.
- [IMPROVED] the documentation on the "sovlers" part
- [IMPROVED] move the "how to compile" section of the readme in the documentation
- [IMPROVED] `SuiteSparse` is upgraded to version 5.13 (issue with build system based on cmake and BLAS for SuiteSparse >= 6.0)
- [IMPROVED] upgrade to eigen `3.4.0` (stable release)

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- [BREAKING] drop support for numpy version < 1.20 (to be consistent with grid2op)
- [FIXED] a compatibility issue with grid2op 1.7.2 (missing another backend attribute
when the environment is copied) see https://github.com/rte-france/Grid2Op/issues/360
- [FIXED] now an error if thrown if the bus indexes in the pandapower grid are not contiguous
or do not start at 0 (thanks Roman Bolgaryn for spotting this issue)
- [ADDED] automatic build for python 3.11
- [ADDED] support for numpy >= 1.24 (some deprecation *eg** np.str and np.bool are removed)

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- [FIXED] a compatibility issue with grid2op 1.7.1 (missing a backend attribute
when environment is copied)